Closed-End Punch Strippers - NAAMS METRIC SIZE CLOSED-END PUNCH STRIPPERS WITH RETAINER SHOULDERS Designed to comply with NAAMS ( North American Automotive Metric Standard ) & FORD World Standard. The shoulder design of the DIE-THANE™ stripper prevents the strippers from falling into the die. Fits most standard retainers for head type and ball lock type punches.          I.D ( Fits Punch ) mm Catalog Number Overall Length ( mm ) Air Hole Size ( mm ) O.D (mm) 10 PRS- 10- 43 43  52  63  72 1.6 18 13 PRS- 13- 43 43  52  63  72 3.0 23 16 PRS- 16- 43 43  52  63  72 3.0 28 20 PRS- 20- 43 43  52  63  72 3.0 33 25 PRS- 25- 43 43  52  63  72 3.0 40 32 PRS- 32- 43 43  52  63  72 3.0 50 38 PRS- 38- --   52  63  72 3.0 60 40 PRS- 40- 43 43  52  63  - 3.0 60 SHANKØ OF PUNCH OVERALL* LENGTHS L A PRESS FIT B C D** E VENT HOLE 43 52 63 72 10.0 X X X X 9.75 18.5 21.3 6 1.6 13.0 X X X X 12.75 23.5 26.3 6 3.0 16.0 X X X X 15.75 28.5 31.3 6 3.0 20.0 X X X X 19.75 33.5 36.3 7 3.0 25.0 X X X X 24.75 40.5 43.3 7 3.0 32.0 X X X X 31.70 50.5 55.3 7 3.0 40.0 X X X - 39.70 60.5 65.3 8 3.0