Features

• Rosette (self-assembly) thumbscrew knob The cap of these knobs can be assembled into a fully screw-in knob by inserting a perforated screw (sold separately) into the base of the cap. Joins by pressing together in a perpendicular direction.　To prevent excessive pressure, use a stop or spacer equal to the length of the thread (excluding the thread head).　All are 38 mm in diameter and made of black derlin acetal resin.