... Made of special material steel:40Cr ER collet is one kind of the Spring Collet and it is usually to be used ... to make ER collets.We choose the high grade spring steel-65 Mn as the material,so we can ... Machinery Co., Ltd can provide various kinds of ER collet, such as ER8,ER11,ER16,ER20,ER25,ER32,ER40, ... ER50 etc. The clamp force of our ER collet is big, the clamp arrangement is wide and the ...