Zinc Standardization Plates, S-34 (5 pcs.)

S-34 Zinc Standardization Plates are used to evaluate the abrasion characteristics of S-42 and S-33 sandpaper strips.  Each plate is 4” square, .032” zinc with ¼” center hole.  Note, the S-34 zinc plate should not be used for more than 10 calibrations per side.  (5 pcs.)