Pedros Pro Cassette Lockring Socket

A pinless, machined alloy-steel socket with deep splines and quick-spin knurling for workshop cassette and compatible disc-lockring work.

The 12-spline profile has a 23.5mm outside diameter, with 3/8-inch square and 24mm external drives. The stated internal clearance is 19.8mm diameter by 21.5mm deep; actual lockring and axle fit must agree.