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Jack

Jack Retain-iT 50 x 450mm Galvanised Steel Joiner Post Sleeper Upright

★★★★★
85 reviews · 388+ sold
$40.08 $60.12 -33% OFF
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Last purchased 24 minutes ago by someone in Geelong
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The Jack Retain-iT 50 x 450mm galvanised steel joiner post lets you convert timber sleepers into retaining walls quickly and securely. As a joiner post, it sits between two runs of sleepers, supporting the wall where sections meet and giving a snug fit as each sleeper is inserted.

  • Width x length: 50 x 450mm
  • Type: Joiner post (upright)
  • Material: Galvanised steel
  • Finish: Galvanised
  • Gauge: 220mm
  • Model: 16041

The Retain-iT system makes building timber retaining walls straightforward for landscaping and garden projects. The galvanised steel construction provides strength and longevity, holding sleepers firmly in place for a clean, durable finished wall.

More about this product

The Jack 50 x 450mm Joiner Post Galvanised Steel Retain It Sleeper Upright is designed to convert timber sleepers into retaining walls, providing a durable and secure solution for landscaping needs.

  • Galvanised steel construction for longevity and strength
  • Joins two sleeper runs where sections meet
  • Designed for a snug fit upon installation

Size: 50 x 450mm. Material: Galvanised Steel. Finish: Galvanised. Model: 16041.

Questions & Answers

What is this joiner post used for?

It converts timber sleepers into retaining walls, supporting the wall where two sleeper runs meet.

What size is it?

It measures 50 x 450mm.

What is it made from?

Galvanised steel for strength and longevity.

How does it fit the sleepers?

The design allows a snug fit as each sleeper is inserted into the post.

Is it suitable for outdoor retaining walls?

Yes, the galvanised finish makes it suited to outdoor landscaping applications.

Standard Shipping Australia-wide
Ships in 1-2 business days from our Australian warehouses
30-Day Returns
Change your mind? Return within 30 days for a full refund. Item must be unused and in original packaging.

Customer Reviews

4.3 ★★★★☆ 81 reviews
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✓ Fast Delivery ✓ Great Quality ✓ As Described Verified Purchases
J
Jessica L. 📍 Toowoomba QLD
★★★★★
2 months ago
✓ Verified Purchase

Already bought a second one

Placed the order in the evening and got a shipping notification the next morning. Arrived 2 days later in great condition. Product is well made and does everything it should. Really happy with the whole experience.

B
Ben A. 📍 Fremantle WA
★★★★★
2 months ago
✓ Verified Purchase

Quick delivery to regional QLD

The Jack Retain-iT arrived fast and works perfectly out of the box.

G
Grace W. 📍 Parramatta NSW
★★★★★
2 months ago
✓ Verified Purchase

Perfect gift — loved it

Bought this as a replacement for one I have had for years and I am glad I upgraded. The new one is noticeably better. Had a tracking number within a few hours of ordering. Packaging was excellent, nothing damaged. Already told a few mates about this site. Great prices and genuinely fast shipping.

O
Oliver H. 📍 Rockhampton QLD
★★★★★
2 months ago
✓ Verified Purchase

Arrived well packed

The Jack Retain-iT is a solid buy. I was a bit unsure about the size from the photos but it is perfect in person. Delivery was faster than expected. Very satisfied with this purchase.

N
Natalie F. 📍 Launceston TAS
★★★★★
3 months ago
✓ Verified Purchase

Better than expected

No issues at all. Fast delivery and exactly as described.

C
Chris N. 📍 Mackay QLD
★★★★★
3 months ago
✓ Verified Purchase

Great value for money

Spent a while looking for the right Jack Retain-iT and this kept coming up as the best value. I can see why — quality is impressive for the price. Delivery took just 2 days to Townsville which is great. Packaging was solid and everything intact. My partner and I both use it daily now. Highly recommended.

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