The knipex 44 21 series of internal bent circlip pliers are constructed from chrome vanadium solid style forged top quality steel with precision non slip tips for added strength and durability like most of the knipex range of pliers all components are oil hardened with polished heads and plastic coated handles knipex circlip pliers are ideal for all trade or diy applications and especially the automotive trade 44 21 j11 bore size 12 25mm44 21 j21 bore size 19 60mm44 21 j31 bore size 40 100