Description: 15pcs ER11 1-7mm Spring Chuck Collet with ER11A 5mm Extension Rod Holder for CNC Milling Lathe Tool Specification: Materialsteel TypeER11A Height38mm (when the lock nut) Shaft hole5mm (+0.02 mm) ModelER11 Precision<0.012 MaterialSpring Steel Gripping Range1 mm, 1.5 mm, 2 mm, 2.5 mm,3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 1/4", 1/8" Upper Diameter12mm Bottom Diameter8mm Height20mm Quantity15pcs Features: ER straight rod type collet extension handle, the handle body is relatively long, suitable for deep hole processing. Can reduce the use of tools, reduce costs, improve efficiency. The outer diameter of the rod and other parts of the rod can be eliminated by precision grinding, which can eliminate the unbalance and increase the stability of the cutting. Ground Roughness is Ra0.4 Microns, plus overall fine polish Suitable For: Boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processing T.I.R.: 0.0003" or 5um. Durable and practical. Special angled slots increase rigidity. Protects tool holder from contaminants. Better overall balance of tool holder assembly. Use with any standard ER collet chucks for coolant-thru tool applications. Package Included: 1 x ER11A 5mm Extension Rod 15 x ER11 Collets
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