400pcs combination drill set Item No. SM8100400 - 400pcs combination drill set -21pc titanium coated HSS drill bits: 1.0, 1.5, 2.0, 2 ... 19, 25, 25mm- 1pc quick changer- 38pc wood-boring drill bits: 3.0x4, 3.2x2, 3.5x2, 4.0x4, ... 1pc magntic holder- 5pc aluminum dxide grinding wheel- 23pc masonry drill bits: 3.0x2, 3.5x2, 4.0x2, 4. ... 1pc extension holder Item No. SMD8100400 -400pc combination drill set