Special Threads, Gauges Intro CPR-S Inspection Tools SP Check Pins (Straight Type) for Bored Hole for Forming Taps FEATURES SL HSS HSS material increases considerably the Check Pins life.CPR-S allows accurate checking of bored hole diameterand length. For forming tap. PO ST ROLL YMW-CPR-S CARBIDE TYPE: CPR_01 DCON D1 D2 L1 L1 L2 L2 LONG L3 L3 L L LF HAND TAPS EG (STI) SPECIAL THREADS, GAUGES YMW THREAD MILLS DIES CENTER DRILLS Technical info 572