Ivy Classic Screwdriver 17073 9 Inch Mega Magnetic Ratcheting Power Pro Grip (48 Tooth Multi Bit S2 Tool Steel Hand Fastener Holding System) 8" Laser Welded Diamond Segments: High strength laser Laser Welded Diamond Segments: High strength laser welding anchors diamond segments to the steel barrel to resist shear stress under high torque drilling conditions Manufacturer Bosch Power Tools Model Part Number SDH30 Set Total Piece Count 3 Piece High Speed Steel Step Drill Bit Set Bit Material Metallurgy Industrial Grade Heat Treated High Speed Steel (HSS) Total Sizing Hole Increments 13 Step Sizing Diameters Across Set Minimum Cutting Hole Diameter 0 and structural fitment tracking for all standard 1 inch insert accessories Keeping the bit connection clear of packed sawdust particles maximizes the downstream flux conduction loop