uxcell Silver Tone 50x4mm Water Cooling Cooler Block Screws Kits for CPU GPU Product Name : Water Cooling Block Screw;Thread Size : 50 x 4mm/ 2" x 0.16"(L*D) Spring Length : 10mm/0.39";Round Block Size : 8 x 3 x 4mm/0.31" x 0.12" x 0.16"(OD*ID*H) Screw Nut Size : 7 x 3.5mm/0.28" x 0.14"(OD*ID);Plastic Ring Size : 8 x 4mm/0.31" x 0.16"(OD*ID) Main Material : Metal, Plastic;Color : Silver Tone Net Weight : 26g;Package Content : 4 x Screws4 x Round Block4 x Screw Nuts4 x Spring9 x Plastic Ring