Screw is included! With 6 Pieces Screws for mounting. (Note: when mounting with screws, don’t screw too tight as to warp the levels body)Size: 58mm H x 44mm W x 13mm D. (2.26 inch H x 1.72 inch W x 0.51 inch x D) Handheld size,convenient to keep in your tool bag or on the go bag, compact and lightweight.Each level consists of 2 steady bubble marked for easy read on a plastic T shape backing. Easy to read bubble, bubble respone fast, the bubbles can be gathered within 2 second after impact.Each T level has two screw holes for mounting and a flat back.(Note: when mounting with screws, don’t screw too tight as to warp the levels body). The holes are provided for screwing to a surface permanently, also you can use the holes to turn these into a string line level.You can use double-sided tape on the back.Applicable: T-level can be mounted to a counter or on your furniture or machinery, adjust hanging pictures or other decor; level trailer or camper, adjust pool tables or ping pong tables, adjust telescopes or cameras or other tripod mounted devices; adjust washing machine, wood measuring tool, appliances, etc. Product Description Description: Main Material: Acrylic+ Plastic.Color: Fluorescent Yellow-green.Size Detail: 58mm H x 44mm W x 13mm D. (2.26 inch H x 1.72 inch W x 0.51 inch D).Package Includes: 3PCS x Bubble Level. How to use: Each level has two screw holes for mounting and a flat back.(Screw is included!!!!!! With 6Pcs Screw for mounting.)(Note: when mounting with screws, don’t screw too tight as to warp the levels body).The holes are provided for screwing to a surface permanently, also you can use the holes to turn these into a string line level.You can use double-sided tape on the back.This T type level is Two ways multipurpose, adjusting Angle Level Horizontal, can make you cross check accuracy by turning the level to compare to your marked measurements. Functions: This level can adjust camera, tripod mounted, other devices, etc. Details: Size : 58mm H x 44mm W x 13mm D. (2.26 inch H x 1.72 inch W x 0.51 inch D). Advantage: With 6Pcs Screw for mounting. Handheld size, convenient to keep in your tool bag. Easy to read bubble, bubble respone fast, the bubbles can be gathered within 2 second when using. Applicable: This T type level is Two ways multipurpose, adjusting Angle Level Horizontal, can make you cross check accuracy by turning the level to compare to your marked measurements.Small pocket size bubble T-levels can be permanently mounted to a counter in your RV or on your furniture or machinery so you can always check if it is still level.T type level can used to hanging pictures or other decor.Very useful when leveling your RV or items in your RV.T type levels can attach to the tongue or back bumper of a trailer or camper hitch to adjust level.Attach to pool tables or ping pong tables to adjust level play.Adjust machine tools.Adjust telescopes or cameras or other tripod mounted devices.Adjust Washing machine, furniture placement.Adjust wood measuring tool, equipment, appliances, etc.