This wood chuck set for 95 mm (3.75 inches) is a mechanical device used to clamp a workpiece on a machine tool. Made of steel, the set is durable and sturdy. As a machine tool accessory, it uses the radial movement of movable jaws evenly distributed on the chuck to clamp and position the workpiece. This wood lathe chuck set includes a 4 jaw self-centering chuck and interchangeable jaws for spindles, bowls, and work-pieces that are hard to be secured. The set will fit 1" x 8 TPI spindle. Colour: Red and black Material: Steel Number of jaws: 4 Self-centering Chuck diameter: 95 mm (3.75 inch) Carrying case dimensions: 30.5 x 22.5 x 7.5 cm (L x W x H) Inside grip diameter range: , 1 Step jaws: 2.5 mm - 35 mm , 2 Round jaws: 32 mm - 64 mm , 3 Round jaws: 76 - 108 mm , 4 Pin jaws: 9.5 mm - 45 mm , 5 Flat jaws: 73 mm Outside grip diameter range: , 1 Step jaws (Lower step): 38 mm - 73 mm , 1 Step jaws (Upper step): 19 mm - 51 mm , 2 Round jaws: 45 mm - 80 mm , 3 Round jaws: 90 mm - 124 mm , 4