Proxxon industrial microspeeder 7 piece combination spanner set proxxon 23124 p proxxon industrial s microspeeder spanners have a 72 tooth inner ring made from high alloy special steel which allows ratcheting even when the spanner can be moved through 5 deg they also have a lever which means the direction of rotation can be removed without removing the spanner head saving you time p proxxon industrial 23124 microspeeder combination spanner set 7 piece