2pcs L-shaped 7-shaped Handle Screw M5 20mm Male Threading Rotating Knob Package includes: 2 x M5 Rotating Knob Adjustable Thumb Lever Screws It is made of high quality aluminum alloy. durable and easy to use Color: Red Easy to adjust. can be used in photographic equipment When there is an accessory obstacle blocking the knob to be screwed in. only pull the thumb knob and rotate the knob to overcome the obstacle. This design is very useful