Specifications of ER20 Extension Rod:
Rod Hole Dia: 16mm
Rod Diameter: 25mm
Brand name: CNBTR
Color: Silver & Black
Suitable Chuck: ER20
Nut Type: Type A
Size: 58x33.8mm/2.28x1.33inch(L x Dia)
Weight: 175g

Specifications of Spring Collet:
Brand name: CNBTR
Model: ER20
Gripping: 1MM to 13MM
Length: 31.5mm
Diameter: 21mm
Weight: 493g
Package included: 13 x ER20 Collets (1MM, 2MM, 3MM, 4MM, 5MM, 6MM, 7MM, 8MM, 9MM, 10MM, 11MM, 12MM, 13MM)

Features:
1.The nuts of ER20 Extension Rod could be tighten straightly, high rigidity, strong clamping.
2.Spring collet made of quality spring steel production, with good flexibility and abrasion resistance.
3.Spring collet has highly clamping force, wide clamping.

Installation Steps:
1.Remove the nut and insert the collet eccentrically
2.Insert
3.Tighten the nut
4.Pull out
5.Eccentrically remove the collet

Package Content:
1 x Motor Extension Rod
13 x ER20 Collets