... pieces Specification1.Thread type: machine thread, triangle thread, metric thread, tapping thread, drilling thread, half thread, full thread etc.2.Head type ... . Other machines including Spring machine Jinju & 502S, Shaft machine Liqiang ,Auto lathes Libo & XB,CNC machine SHENGYU & SYX42,Inclinable press machine WORLD & J23-80/ J23 ...