The Twist-a-Nut 21-in-1 Screwdriver is made of heavy-duty chrome vanadium shafts and provide robust strength for long life/professional use. The premium screwdriver ratchet mechanism can handle high torque without failure. The wire nut connector wrench reduces finger fatigue and gets in tight spots. It has an ergonomic, slip resistant, comfortable, textured grip to provide better torque. It resists perspiration, water, oil, chemicals and has Accu-Loop wire looping hole. It has size 1, size 2, size 3 tips and includes slotted 3/16 in., 1/4 in., 5/16 in., Phillips #1, #2, #3, nut drivers of 1/4 in., 5/8 in., 7/16 in., square size 1, size 2, star size 15, size 20, size 25, size 30, hex 3/32 in., 1/8 in., 3/16 in., 3/32 in., wire nut connector wrench and wire looping.