Steel cutter to cut steel Sheet, wires, rivets and chains up to 3/16 inch wide. Cutter are performing electrical repair and other mechanical jobs that are working with wires. Those handles are fitted with high quality plastic sleeves that offer insulation to let you work with live wires for electrical repair jobs. These sleeves are very comfortable to grip. These pliers forged and deferentially heat treated. Good application our products are made of well selected materials and by superb workmanship. Well crafted metal surface is black coated, sandblasted, and polished. The soft red pvc cushioned handle makes mosaic glass work effortlessly. The breaking plier with a spring-loaded jaw is to release pressure easily when breaking glass along a score. The running plier with an adjustable screw could help you decide how much pressure you apply to the stained glass. They do a good job on straight cut also curves. For the running pliers, no groove on its head. It is used with the rubber tips on.