Description: Material: 6AL/4V(TC4)Titanium Alloy,Grade 5 Weight :1.5 Gram/Piece; Wrench Size:Use 4mm Allen key Thread Pitch:0.8mm Head Size:8.5x5mm/0.33"x0.2"(D*H) Thread Diameter:5mm/0.2'' Important note: When the length is less than or equal to 25 mm, it is a full thread. When the length is greater than 25 mm, the threaded part is about 25 mm. Price is for Only 1 bolt.