<ul><li>How to choose: eg. 4mm to 3.175mm, 4mm is motor shaft's diameter, 3.175mm is flexible shaft's diameter, please check the size you need.</li><li>These stainless steel flex collet coulpers with grub screw fit for 3.175/4.0/5.0mm motor shafts and 3.175mm flex drive shaft</li></ul> -- Description -- These stainless steel flex collet coulpers with grub screw fit for 3.175/4.0/5.0mm motor shafts and 3.175mm flex drive shaft They are for round end cables How to choose: eg. 4mm to 3.175mm, 4mm is motor shaft's diameter, 3.175mm is flexible shaft's diameter, please check the size you need. -- Specification & Features Material stainless steel Sizes: 3.175mm to 3.175mm,4mm to 3.175mm,5mm to 3.175mm -- Item Contains -- 1 piece of Stainless Steel Flexible shaft Coupling Item Pictures

RC Boat Shaft Coupling Joint 3.175mm 4mm 5mm Motor Shaft to 3.175mm 1/8\" Flexible Shaft Coupling Joint Collet(3.175mm to 3.175mm)