Supply of 90 drill holes since excavation dedicated factory direct 90-hole drill drill 90 holes since I plant specializing in the development of the franchise drill pit, excavation for the construction of the soft layer, sand layer, low cost, easy construction welcome to inquire, self-feeding type anchor Technical Data General Standard provides the following table: Size JT22 JT25 JT28 JT32 outside diameter (mm) 22 25 28 32 tensile strength (KN) ≥150-180 ≥150-180 ≥180-220 ≥220-250 grouting aperture (mm) ≥12 ≥15 ≥17 ≥22 hole diameter (mm) 42 42 42 51 L thread direction (right-handed can be customized) Standard length (m) 3 3.5 4 4.5 ± 2.5 length error % Notes: 1) Thread Direction: As noted in the construction may need to change. 2) Standard length: can be sized according to site requirements. 3) Drill: Depending on the stratigraphy, with various forms of drill 4) factory according to the user's technical requirements, a variety of custom hollow bolt and strength. Luoyang River Thai Technology Co., Ltd - hollow bolt manufacturer - produce processing a variety of types of hollow bolt grouting anchor self-feeding type anchor steel pipe shed with flower tube quality affordable welcome new and old customers to inquire