Be confident in your purchase, we are a certified MADI Dealer. How cool is that?? Main Uses: Screwdriver ? 3/8? screwdriver for opening the primary door on 3 phase transformers Removable Penta Wrench ? Designed for opening all transformers switch gears Hand Hole Lid Lifter ? Built-in design for lifting hand hole lids Additional Features: Speed Sleeve? ? The green handle spins freely to open transformers switch gears 2X faster Life Durability ? Heat-treated alloy steel Removable Penta Wrench ? Designed for opening all transformers switch gears The PENTA-DRIVERTM range of products features the Madi Tri-Penta Lineman Wrench. This underground utility wrench combines three everyday functions into one convenient tool. The ? Penta Socket opens transformers and switch gears. The addition of a high visibility patent pending Speed Sleeve helps linemen open those transformers and switch gears up to 2X faster than standard penta sockets or wrenches. It also comes with 2 other tools built into the handle ? the integrated Lid Lifter lifts hand hole lids and the 3/8? Screwdriver is great for opening secondary or primary doors.