如果不是焊, 选择正确的螺丝, 直接决定了steel stud建筑的质量。牙纹, 尖尾由最后一层或主要层决定, 头型有表面材料决
PrimeryColor
2017-10-05 09:55:10
( reads)
所以, bugle head for drywall surfaces
fine thread, sharp point for light ga steel, selfdrilling point for heavy ga steel, coarse thread sharp pt for wood/soft wood studs