10 pcs Plastic Tri-Glides 3/8 Inch (10.7 mm) 10 pieces per pack. Free shipping. Work with 3/8 Inch (10.7 mm) webbing, strap. Made of Polyoxymethylene (POM), also known as acetal, polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts that require high stiffness, low friction and excellent dimensional stability. Dimension 3/4" x 1/2" x 5/32" (19 mm x 13 mm x 4 mm) Item number: PK1057 Black