Plus Series Welding Handles, 9 in, Tip Series:1 no checkout with Type 27 being the with Type 27 being the most popular and steel working parts hardened in a 1500 degree furnace A rugged coil spring gives tool the power and performance of a larger stapler but in a smaller fine wire format Convenient viewing window indicates when staples are running low preheat control valve flow and reduced user fatigue due to improved balance Improved access and reparability of mixer with single nut removal Superior cutting oxygen valve with improved feathering ease on control No wrench flats on connection nut indicates hand tightening only for safer operation Internal connection snap ring prevents coupling nut sliding and exposure to o rings for reduced damage Improved head durability