... screw or Connecting screw1.Head type:Flat Pozi ,Flat Hex Socket.2.Standard: ANSI, ISO, DIN, BS, JIS, AS 3.Material ... , Cr+3, hot dip galvanized, brass plated.Sizes: Hex socket: 1) Deep hole: 7 x 50 2) Shallow hole: 7 x 50 ... 3) Deep hole: 5 x 50 4) Shallow hole: 5 x 50 ... 5) Deep hole: 6.3 x 50 6) Shallow hole: 6.3 ...