Chromium-molybdenum alloy steel. These are great to use in confined or hard to reach spaces like pulley core screws or water tank frame screws, etc.
Sizes & Lengths:
8 x 10mm -235mm long
10 x 12mm - 291mm long
12 x 14mm - 328mm long
13 x 15mm - 368mm long
14 x 17mm - 368mm long
16 x 18mm - 407mm long
17 x 19mm - 407mm long
19 x 21mm - 415mm long
22 x 24mm - 430mm long