Signswise 5mm Un-threaded to 3/16" 4.76mm Stainless Steel Collet Coupler Shaft for Rc Boat This stainless steel 4.76mm Rc Boat Flex Collet Coupler / Flex Shaft Collet for 3/16" For Vehicle Brand:Zenoah, or 23-26cc gas engine Connected to the motor shaft = 5mm access shafts = 4.76mm Length = 33mm Type:Boat parts weight:0.1kg Package Size :13cm*11cm*2cm