Gatco Sharpeners Thumb Screws- 2 Each. These are replacement Screws for the GATCO knife clamp/ angle guide. Specifications for Gatco Sharpeners Thumb Screws- 2 Each: Weight: 0.04 lbs. Height: 9.25 in. Width: 7 in. Length: 0.25 in. Package Contents: Gatco Sharpeners Thumb Screws- 2 Each Gatco Sharpeners 17003: Thumb Screws- 2 Each