7pc Hollow-Shaft Nut Driver Set (Metric)Heat Treated Carbon Steel Construction High Visibility Color-Coded Handles are Easy to Locate & Identify Non-Slip TPR Handles Allow Maximum Twisting FORCE with no Discomfort Precision Machined Socket Heads 3" Shafts Sizes included: 5,6,7,8,10,11,12mm Hollow shaft lets you remove nuts from protruding bolts