When threaded properly they can be pulled tight and the teeth lock the belt or webbing in place so that they grip harder as the load gets heavier. They will release at a touch. I believe them to be nickle plated steel and are very strong.
Replacement Parts - 1 Metal Tri-Glide Slider Buckles Black
These fit well with 1 (25 mm) webbing / strap. Overall measurement: 1-1/2x1-3/8(38 x 30mm). See next pictures for its measurement. Pick your wanted color! 4 pieces of one color. Made of zinc alloy metal with rust-preventive coating. High strength and high resistant to corrosion. Great addition to any backpack for a safe and secure hold.
CRAFTMEMORE Strong Metal Ladder Lock Tri-Glide Tension Lock Slide Buckle Adjustable Backpack Strap 4pcs SC82
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