In summary, it is essential to understand the differences in the various types of cutter construction in order to select the right cutting tool. Joint construction is a major factor in determining cutter life and blade alignment for quality of cut. The four types of cutter joints are: rivet lap joint, box joint, screw and nut lap joint and the matched bearing ring plus screw and nut joint. Also critical to the performance of the cutter is the head shape, of which there are also four common types: tip cutters, oval head, tapered head and angulated cutters. The most common types are the tapered and oval head cutter. The type of edge on the cutter determines the type of cut it will perform and the proper usage of the cutter. Cutter edges are hardened by an induction and oil quenching process and they are tempered to reduce the stresses caused by the hardening process. Proper alignment of the edges ensures a good clean cut, one that can be detected by a snap or ping sound. All Aven Accu-Cut cutters are provided with ESD safe ergonomically designed hand grips.