BDop Track Cog and lockrings are Cold-Forged Steel: (ASM4140) and heat-treated (hardened and double tempered) for durability: 1/8″ chains (3mm). Available in: 13T ~17T.
The BDop Track Wrench is also made from hardened stainless steel. It has a 15mm box wrench, a Ø42/ Ø44 lockring tool as well as a handy-dandy beer opener. The only question is which tool will you use first?
Need a few more cogs?