Miniature Worm Gear ClampsMeets or Exceeds SAE J 1508 Type M1/4" Hex Head Slotted Screw5/16" Wide Perforated BandThis American Style Micro Gear Clamps materialsW4: All made of AISI 300 Series Stainless SteelW2: Band & Housing made of AISI 201/ 301/ 304 SS; Screw made of Zinc-Plated SteelW1: All made of Galvanized SteelSizes for Miniature clamps belowInches (Inch) Metric (mm)7/32 to 5/8 6- 165/16 to 7/8 8- 227/16 to 1 11-251/2 to 1-1/16 13-279/16 to 1-1/4 14-3211/16 to 1-1/2 17-38 7/8 to 1-3/4 21-44