1.Material:45#carbon steel 2.Colour:white,black 3.Easily operation 4.High efficiency function:connect two rebar ends This rebar coupler can connect rebar diameter from 16mm to 40mm, it belongs to Rib peeling roll stamping system. Working principle:First, slice up the end of rebar;Second, peel the rib of the end of rebar;Third, joint two rebar ends with one rebar coupler. Certificate: