Pedros Cassette Lockring Socket w/ Pin Removal ToolPro Cassette Lockring Socket with Pin. The Pro Cassette Lockring Socket is designed with the professional mechanic in mind the extra deep splines ensure engagement while the quick spin knurling provides speed and control. Backed by Pedros lifetime warranty. Alloy tool steel socket is fully machined to precise tolerances for an exacting professional level fit and optimally heat treated for maximum strength and longevity Features extra long splines for