RUIMI Titanium Step Drill Bit, High Speed Steel HSS Quick Change 1/4" Shank Total 31 Sizes 3-Piece Set Tool for Carbon Steel, Sheet Iron, Insulation Boards, PVC Boards, Planks, and Wood Features: === Drill 19 hole sizes.=== This compact set replaces 31 individual drill bits.=== Titanium nitride coating for cooler running.=== Quick-change 1/4" hex shank.=== High Speed Steel for long service life.=== They also help to enlarge existing holes.=== The two flute design tips made the penetration faster without chipping. === Application: suitable for below 25 hardness of the work piece, such as carbon steel, sheet iron, insulation boards, PVC boards, planks, and wood thickness below 5MM. Specifications:Material: High speed steelSizes of the 3 Step Drill Bits: 15 Step bits from 4-32mm 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32mm 9 Step bits from 4-20mm 4 6 8 10 12 14 16 18 20mm 10 Step bits from 4-12mm 4 5 6 7 8 9 10 11 12mm Package included:3 x Drill Bit RUIMI Warranty Description:If this item was damaged within 30 days,Please send E-mail to us (add items damaged photo)Plan A :We will return all money to you Plan B:we will resend new one for you,meanwhile we pay the return shipping fee
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