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.
ZQMALL 20pcs Plastic Ladder Slider - Adjustable Buckle Tension Locks Black for Webbing Backpack Belt Straps Camping Suitcase (32mm) Q087
1 Size Leathercraft Buckles for sale
1 Size Adjustable Slider Buckle Leathercraft Buckles for sale
Las mejores ofertas en Hebilla Deslizante Ajustable de metal sin marca Hebillas Para Trabajos en Cuero
Las mejores ofertas en Tamaño de 1 Hebillas Para Trabajos en Cuero
DGOL 10 Pcs 3/4 inch Strong Heavy Zinc Alloy Ladder Lock Slider Metal Adjustable Webbing Release Buckles (Silver)
MATERIAL: ZINC ALLOY ,NOT PLASTIC QTY: 6 PCS IN TOTAL SIZE: INSIDE WIDTH IS 1-1/2 (38MM),USED FOR 1-1/4 to 1-1/2 WEBBING AND STRAPS USE SPECIAL
DGOL 1-1/2 inch Heavy Duty Metal Zinc Alloy Ladder Lock Slider Adjuster Webbing Release Buckles 6pcs (Gunmetal)
(10 Pack) 2”Inch(50mm) Curved Ladder Lock Slider Buckles/Tension Locks(High Release)- for 2”(50mm) Webbing “Mojave” Manufactured byNational Molding -in Coyote Brown (Color) - Made in USA (10)
20 Metal buckles 1 Triglide / Ladder / Tension Slide Lock type steel very strng
Las mejores ofertas en Hebilla Deslizante Ajustable Hebillas Para Trabajos en Cuero
4Pcs Meetee 20/25/32mm Backpack Strap Buckles Tri-Glide Adjuster Webbing Slider Hook Clasp Belt Buckle Hardware Accessories
Metal Adjustable Slider Buckle Leathercraft Buckles for sale
Metal Adjustable Slider Buckle Leathercraft Buckles for sale
20 Metal buckles 1 Triglide / Ladder / Tension Slide Lock type steel very strng
Metal 1 25mm Tension Lock Triglides Slides Adjustor Clip Strapping Bag Buckles