The Star Hex Key set consists of 9 pieces of L -shaped long arm hex keys made of alloy steel for strength and long lasting performance. The keys resist rotational distortion and the finish provides resistance to corrosion.Perfect for reaching difficult or tricky screws and nuts. The star hex keys has a tamper proof hollow centre. Sizes includes: T10, T15, T20, T25, T27, T30, T40, T45 and T50. Lengths ranges from 90mm (3-1/2") to 225mm (9").