The US PG worm drive clamp from Oetiker is manufactured in compliance with the standards set by the SAE J1508 Type F. It is available in two models namely the 126 Material which is made of a UNS 201 band and a UNS 301 housing. Its hexagonal head screw is made from a zinc anodized carbon steel. The 177 is composed of the same parts, but its hex-head is made from UNS 410 stainless steel.