Different expansion bolt forms use different drill diameters to measure the larger outer diameter of the bolt. Ordinary, cheap, M10 d12, M12 d14, M16 d20, not the same, the big disadvantage is to put the bolts before you can place the equipment that needs to be fixed, in case you have a lot of equipment base fixing holes, then you can't put the equipment in any case after you put the bolts. The expansion of the car repair and the expansion of the movement, the diameter of the drilling hole is the same as the diameter of the bolt, and the equipment can be put into the hole.
There is no high requirement for the depth and cleanliness of the concrete cavity of the Wedge Anchor, which is easy to install and inexpensive. Select the appropriate burial depth according to the thickness of the solid roof, with the increase of the burial depth of the Wedge Anchor, the tensile force increases, and the Wedge Anchor has a reliable expansion function.