All Ivy Classic insert bits are manufactured from S-2 Tool Steel.
The Rockwell Hardness is 60-62 HRC
See size chart
Philips #1, Philips #2, Philips #3, Philips #2 réduit, Fendu #6-8, Fendu #8-10, Carré #1, Carré #2, Carré #3, Torx T10, Torx T15, Torx T20, Torx T25, Torx T27, Torx T30, Douille
1", 2", 2 3/4", 3", 3 1/2", 1/4", 5/16", 3/8"
10, 25, 50, 100
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