ITEM NAME:6pcs/set accessories multifunctional high-speed steel countersunk bit set Features: 1.MATERIAL: made of high speed steel, high abrasion resistance, obtain accuracy, high-speed cutting for the high hardness. 2.WIDE USAGE: Suitable for aluminium, cast iron, copper, magnesium alioy, plastics, wood, etc. 3.Chip Removal Quickly: The designed chip removal groove, it can discharge the chip rapidly, and will not cause the crack and stuck piece phenomenon. 4.Set Includeds: 1 pc x pipe hole opener extension rod, 1 pc x bimetal hole opener center drill 6-72mm, 3 pcs x high speed steel center drill 6-72mm, 1 pc x black allen wrench. 5.Size: Bimetal hole opener center drill Size: (Approx) total L 116mm/4.56inch, handle dia.13mm/0.51inch, 25mm/0.98inch; Pipe hole opener extension rod Size: (Approx) total L 95mm/3.47inch, handle dia. 9mm/0.35inch, 25mm/0.98inch; High speed steel center drill Size: (Approx) total L 67mm/2.64inch, 33mm/1.3inch. Specifications: Material: High speed steel Color: As Shown Bimetal hole opener center drill Size: (Approx) total L 116mm/4.56inch, handle dia.13mm/0.51inch, 25mm/0.98inch Pipe hole opener extension rod Size: (Approx) total L 95mm/3.47inch, handle dia. 9mm/0.35inch, 25mm/0.98inch High speed steel center drill Size: (Approx) total L 67mm/2.64inch, 33mm/1.3inch Package Included: 1 PC x Pipe hole opener extension rod 1 PC x Bimetal hole opener center drill 6-72mm 3 PCs x High speed steel center drill 6-72mm 1 PC x Black Allen Wrench Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement..MATERIAL: made of high speed steel, high abrasion resistance, obtain accuracy, high-speed cutting for the high hardness. WIDE USAGE: Suitable for aluminium, cast iron, copper, magnesium alioy, plastics, wood, etc.