5x Step Drill Bit HSS Step Cone Drill Bit Cutting Hole Drill Kit for Jewelry

Description

Description:
--5PCS High speed steel HSS high hardness step drill bit metric cone drill bit set.
--Titanium coated to reduce friction and heat.
--No need to use center punch, not easy to break compared with ordinary twist drill.
--Automatically deburrs, chamfer, open hole expansion, make a clean hole as you drill.
--Use tools: drill, bench drill.
--The recommended drilling speed is 250-400 rpm.
--Suit for cutting holes in a variety of materials including thin metals, steel aluminium, copper, wood, plastic, fiberglass, brass and PVC etc..
Specification:
Material: High-speed Steel
Drill size:
(3/16，1/4，5/16，3/8，7/16，1/2)
(1/8,5/32.7/32.1/4,9/32,5/16,11/32,3/8,13/32,7/16,15/32,1/2mm)
(1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4)
(3/16，1/4，5/16，3/8，7/16，1/2，9/16，5/8，11/16，3/4，13/16，7/8)
(1/4，3/8，1/2，5/8，3/4，7/8，1，1-1/8，1-1/4，1-3/8)
Package Includes:
5 Pieces /Set Step Drill Bit
SKU: NPR0014497259030574
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