PATENTED DESIGN: Designed to work with the following GB staples mps-2080 5/16 inch, mps-2100 ⅜ inch, and mps-2125 ½ inch metal insulated staples COMFORTABLE: Comfort & ergonomic handle design, easy lever action and front grip area for two handed operation HEAVY-DUTY: Survives 10 ft. Drop EASY TO USE: Rear guide for added Cable control reduces cable twisting RELIABLE: Staple guide ensures full insertion of the staple into the wood without damage to the cable insulation