selfdrilling screws fit the following systems Makita,Senco,Milwaukee,Pam,Grabber Super Drive,Hitachi,Hilti,Ryobi,Helfer Size: #6 - #14Diameter:3.5-6.3Length:8 to 200 mmMaterials: carbon/ stailness steelStandard: GB/ ANSIF /DIN/JIS selfdrilling screws