Dual-side Adjustable And NO SewingThe strap is adjustable on both sides of the 20mm plastic side release buckles.The regular quick side release buckles require to stitch one side. No sewing is needed with these 20mm Quick Side release plastic buckles Because the male and female side of plastic buckle have both two slot to feed the strap through. Simple to useVery easy to use the 32mm plastic side release buckles,Very easy to replace a broken buckle on belt,pet collars etc. Only take off the broken buckles, Then insert the strap into our 20mm plastic buckle clips on both sides.Don't need sewing. Hand Wash Fastening: plastic buckle StrongThe plastic buckles are made of high Grade plastic. These 20mm plastic buckles 3000 tensile tests,the plastic buckle clips can withstand a pulling force of 25kgs(55lbs),hold tension well. Colour: Black Size: 20mm Quantity delivered: 4 pieces