"Swivel clamping screw with smooth flat end. These screws are ideal for clamping irregular shaped workpieces. The screws are manufactured from SCM435(JIS) \/ 34CrMo4(DIN) heat treated to HRC 30 - 35 and the balls are manufactured from SCM21(JIS) \/ 34CrM04(DIN) heat treated to HRC 62. Serrated and domed versions are also available."