Brass boss, plain ot tapped blind hole.
Black, matte finish.
|Ergonomy and design||
The particular knurling on the outside rim of the knob, provided with a structure of very fine pitch, allows a safe and comfortable grip, offering the operator the possibility of operating under the most different working conditions in a sensitive and ergonomic way and simplifying the adjustment of the knob during rapid rotation (or screwing) without any unpleasant angular work for the hand and wrist.
High resilience polypropylene based (PP) technopolymer. Resistant to solvents, oils, greases and other chemical agents.