for TH0004 and TH0037 hydraulic knockout punches THA100 3/4"-16 english thread draw stud Fit TH0004 and TH0037 hydraulic knockout set Made of corrosion-resistant and durable stainless steel, with high hardness and not easily damaged Knockout shaft can assist in dividing blanks for easy disassembly Knockout shaft can assist in dividing blanks for easy disassembly