Description Set Screw Shaft Coupler Material: Stainless Steel Bore: 4 mm to 8 mm The 4mm to 8mm Set Screw Shaft Coupler is made from stainless steel material and offers a 4 mm to 8 mm Bore. View more What's Included 1x 4mm to 8mm Set Screw Shaft Coupler Dimensions Size Bore: 4 mm to 8 mm Links ZIP File Specifications Material: Stainless Steel Weight: 14 g