Features: Made of premium tool steel, hardened,sturdy and high durability Application: In the milling machine, planer, drill press with adjustable angle grinder and regulations on the blade, crossed with other fixtures or clamping the workpiece after the workpiece processing, such as processing slope, slant-hole drilling and the like. It can be a cursor indicates stepless tilt adjustment angle, and then be secured with screws, used to create a variety of fixed angle processing, testing of workpieces. Nickel plated, rust parallelism and verticality precision grinding of each working face to 0.01mm. This Angle V Block features high accuracy and is easy to operate Specification: Material: Tool steel Size: approx. 75 * 25 * 36mm / 3 * 1 * 1.4in Color: as picture shows Use method: after loosening the screws, pull the v-shaped block along the base of the guide rail rotation, looking for the target Angle. 2, using the cursor principle readings, points on the main scale degrees 1°, cursor dividing for 10 '. When the "0" line on the cursor is aligned with the "0" line on the main scale, it means that the measuring face A is parallel to the datum level and the datum level, B is perpendicular to the datum level. 1) when the cursor "0" the right of the line in the main dial "0" line, degree, with cursor "0" read scores with the right of the cursor "0" line scale reading (reading the same as the vernier caliper) read out the degrees (°), A and B measurement plane counterclockwise (') said the turning Angle. When the cursor "0" line in the main scale "0" line left, the degree is still read with the cursor "0" line, the score with the cursor "0" line left scale read. Read out the degrees (°), the (') A and B measure the clockwise rotation Angle of the face. (3) adjust the Angle to the target value and tighten the v-block and the base. Main technical indicators: (1) to measure face parallel to the base face and the measurement of face B, perpendicular to the datum line cursor "0" and the main dial "0" line contact ratio greater than 3 ', vernier scale two endpoints and the main scale two 11°line not coincidence degree is not more than 5 '; Conversely, tighten the screw to make the main lines to dial 0°and the cursor "0" after alignment, A measurement of face and base level parallelism is not greater than 0.01 mm, B measured face and the datum of verticality is not greater than 0.01 mm (2) In the fixed state, the indication error of the adjustable Angle gauge is not greater than±10 ' Package list: 1 x adjustable angle block 1 x wrench .