1/2 Thickness: The 1/2 Gauge allows you to find the 1/2 thickness of any material up to 3-inch thick Perfect For: Create perfectly fitting joints with zero guesswork, set fences, and transfer cutting depths instantly all with no math or measuring No Math or Measuring Required: The 1/2 Gauge automatically finds the center of your workpiece using simple geometry. Lock the measurement in place and set the cutting depth of your saw blade/router bit, or set fences Set Precise Cutting Depths: Lock in the measurement and transfer to the router or table saw to set the cutting depth for lap joints Center Stock On The Lathe: Find the center of stock and mount material on the lathe for spindle turning Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Yellow Material:plastic Package Contents: 1 x 1/2 Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.