Steel liners for use with steels and stainless steels will suit all MIG Guns from B150 to B400 and have part numbers dependant on the wire diameter, from 0.6mm to 1.2mm, as follows:- 0.6mm - 0.9mm = B1535-30.....1.0mm - 1.2mm = B2535-30. 4M & 5M Liners are also available P.O.A.