... 2) Engineers' Features: 1) Engineers' cross pein hammer: 14mm, 16mm, 18mm, 20mm, 22mm, 25mm2) Engineers' ... ball pein hammer: 1 / 4lb, 1 / 2lb, 3 / 4lb, ... 2lb, 2lb, 2 1 / 2lb, 3lb 3) Double faced smiths' hammer: 2 / 3 / 4 / 6 / 8 / 10 / 12 ... / 18 / 20lb 4) Machinist's hammer: 20mm / 22mm / 25mm / 28mm / 30mm / 35mm / 40mm 5) Claw hammer: 21mm / 23mm / 25mm / 27mm ...