Features: According to DIN18.250 class 3 For wooden or steel doors For single-leaf doors Optional for rebated or non-rebated doors Suitable for external fire and smoke protection doors Latch bolt locks Technical data Follower 8mm 9mm Backset 55mm Forend Type: Round head, Square head Thickness 3mm Width 20mm 22mm 23mm 24mmm Forend finish Stainless steel: Satin stainless steel, Stainless steel polished Accessories Striking plate Pocket Lock and striking plate fixing screws Type 55ZL