Manufactured from chrome vanadium steel. -Total length 160mm -Simple to use simply hit the end with a hammer causing the end to spin around and undo / tighten the screws / bits etc... -1/2" drive so can take the bit adaptor off and use standard 1/2" sockets. -Steel structure which allows for strength and durability. -13 x 8mm bits for a wide range of uses. -SET INCLUDES THE FOLLOWING FLAT - 5mm / 6mm / 8mm and 9mm POZI - No 1 / 2 x No2 / No 3 and No 4 HEXAGON - 4mm / 5mm / 6mm and 8mm -Comes in a metal tin for easy storage and transportation