- MAGDRILL 25MM EXTENSION ARBORSpecial Price £49.95 £59.94MAGDRILL 50MM EXTENSION ARBORSpecial Price £59.95 £71.94MAGDRILL 75MM EXTENSION ARBORSpecial Price £79.95 £95.94MAGDRILL 100MM EXTENSION ARBORSpecial Price £89.95 £107.94MAGDRILL 150MM EXTENSION ARBORSpecial Price £99.95 £119.94MAGDRILL 200MM EXTENSION ARBORSpecial Price £135.40 £162.48MAGDRILL 250MM EXTENSION ARBORSpecial Price £179.95 £215.94