DoubleStar Dragon Tooth Thumb Stop M-LOK Black. The Dragon Tooth is a simple handstop with a lot of attitude. Specifications for DoubleStar Dragon Tooth Thumb Stop: Manufacturer: DoubleStar Color: Black Fabric/Material: 6061-T6 Aluminum Length: 1 in Mount: M-LOK Mount Type: M-LOK Material: Aluminum Finish: Anodized Weight: 5 oz Package Contents: DoubleStar Dragon Tooth Thumb Stop M-LOK Mounting hardware DoubleStar DS425: Dragon Tooth Thumb Stop M-LOK Black