3pcs HSS Step Drills 1/4 Inch Hex Shank Titanium Coated Step Drill Bit Set

Description: 3pcs HSS Step Drills 1/4 Inch Hex Shank Titanium Coated Step Drill Bit Set New high-quality three-piece HSS step drill A drill bit can replace the multi-branched Universal Little Helper Specification: Material: High Speed Steel 4241 ( Used for the hardness of the material which is below 25 like iron borad, steel board, PVC board, Insulation board, etc.) Surface: Titanium Plated Type: Straight Flute/ Spiral Groove Handle: Hexagon Shank 1/4 Inch Scop: thin iron plate,aluminum,insulation panels,PVC panels 4mm thickness within the timber. Size Drilling Range( inch) Hole Height(mm) {Straight Flute} Height(mm) {Spiral Groove} Height of Shank (MM) Shank Diameter( inch) 3/16-1/2 3/16,1/4,5/16,3/8,7/16,1/2 6 88 87 24 1/4 1/8-1/2 1/8,5/32,7/32,1/4,9/32,5/16,11/32,3/8,13/32,7/16,15/32,1/2 12 75 75 1/4-3/4 1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4 9 73 72 Suitable for : Products for automotive processing, aerospace, sheet metal processing, installation and maintenance of electrical and other industries, high-altitude operations with hand drills and other tools. Feature: 1, The unique step structure, a variety of standard size drill carve aperture, a box arrived on a ladder drill bit. 2, Without the use of center punch, easy to break, a step drill specifications apply. 3, Deburring, chamfering, expanding the oval hole 4, Small sway, without leading to use a center punch can carve out a nice aperture. Package included: 1x 3/16-1/2 Step Drill 1x 1/8-1/2 Step Drill 1x 1/4-3/4 Step Drill