Includes a pack of 50 Personna regular-duty (0.015" thick) round-edge slotted razor blades which are individually wrapped in paper. Regular duty blades are economical and the reduced thickness fits certain older model Crain tools that take a thinner blade (such as Crain No. 124 Flipper Knife or older No. 301 Cushion Back Cutter or No. 302 Cushion Lock Cutter). Not recommended for use in newer Crain tools which are designed for No. 308C / No. 309C heavy duty blades (0.017" thick). These blades are individually wrapped in paper and come in a laminated paper box. Blade dimensions: length: 2.25", width: 0.75", thickness: 0.015".