ADJUSTABLE SETUP BLOCK: A single unit adjusts to any size between 1/64\" and 1-1/16\" with 1/64\" accuracy. Easy-to-read scales for quick location of reference heights and settings. Router bit height or fence position. Complete your work quickly and easily. Quick adjustment and locking precision: Set precise height with the adjustable setup block in just three steps. Press the quick-adjust button and slide the reference surface up or down to the indicated height. Use the micro-adjustment to your exact size, then tighten the locking knob. Dual scales provide height/depth settings: The \"TOP\" scale measures the height from the bottom of the base to the top of the reference and is used to set the distance between the bottom of the drill bit and the drill press table. The \"BOTTOM\" scale measures the distance from the bottom of the base to the bottom of the reference plate. Ideal for adjusting the base of a drill press. The height of a router bit or the cutting depth of a table saw. 2 scales give you a variety of applications. Premium Quality: The base and reference plate are solid, precisely machined from aluminum alloy, the surface is anodized. The adjustment screw shaft is made of high-quality stainless steel. The tolerance of the laser-etched scale is 0.004\" total cumulative error. This small and convenient height setting tool will simplify all your machine setups, without requiring block combinations or calculations, or any large storage space. COMPACT MULTIPLE USES: This convenient adjustable setup block combines mini size with powerful functionality. You can use it to set router bit height, table saw depth, drill depth, saw fence distance, test cut depth, etc. Size: 120*55*35mm