Collet ER, according to standard DIN 6499, form B, type class 2, size ER 16. Brand Gurfer with reference ER16-2.
Also available: set of ER collets, DIN 6499 B CL2, size ER 16, Ø 1,0 - 10,0 mm per 1 mm, 10-piece, in plastic storage case (ref. ER16SET2).
For mounting tools with straight shank.