Features

• Self-Assembly Thumb Knob
• The cap of the thumb knob can be assembled into a complete 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).　Made of matte black derlin acetal