The 501 feature a thumb adjustable cam that quickly sets the tool to wire sizes between 10-26 AWG (2.588 – 0.405 mm) without the need for any additional tools. Once set, the cam retains it’s setting until reset by the user. The 501 also feature a full by-pass shear cutter for added versatility. The ergonomic design fits comfortably in both small and large hands. Xuro-Rubber grips cushion hands and provide a secure grasp. Xuron’s Light-Touch return spring provides lively return action without excessive effort. Manufactured from a tough alloyed steel and heat treated for enhanced durability.