Keystone short side length: 56mm; trapezoid long side length: 110mm; trapezoid height: 70mm; aluminum thickness: 1mm; fixed slot width: 18.5mm outline standard factory outlets, large favorably! Look forward to your inquire! According to the material can be divided into: a, cast aluminum spike; two, plastic spike; three, ceramic spike; four, glass ball spike; five, reflective beads spike (points 21 and 43 beads beads can be incorporated into aluminum and plastic spike inside) can be divided according to their functions: an ordinary spike; two, solar spike, three, tunnel wired spike; four, wireless spike. According to the number of reflective surface can be divided into: single-sided spike and spike. In the absence of special circumstances, reflective spike means that the average spike. Screw spike, spiral spike manufacturer price spiral spiral spike spike technical requirements: (1) screw spike material is Q235-A steel shall conform to the technical requirements of GB700. (2) the upper thread screw spike for M24, the basic dimensions shall comply with the provisions of GB196 and GB197 thread manufacturing tolerances in accordance with the provisions of 8g. (3) the lower thread screw spike for special M25.6 × 6-d24.0 / 25.6 thread, tooth height 3.25-00.25mm. (4) the end of the prescribed screw spike GB2 manufacturing. (5) forging spiral spike burst round table surface cracks allowed to extend into the shaft. (6) does not allow the threaded screw spike upper thread gauge impede freedom screwed bumps and glitches, double cusp, scratches and threaded allowed to affect the use of incomplete. (7) the lower thread screw spike-shaped teeth should be neat, threaded complete, does not allow splitting traces. (8) screw spike surface does not allow the use of impact dents, burrs, flash, burn and oxide. (9) screw spike physical tensile test should be carried out when the load of 130kN, the screw spike can not pull off.