Lot of 20 SVSQS-M5-30 NBK Cross Recessed Flat Head M5 length 30mm Vacuum Vented Screws Made in JapanLot of 10 SVSQS M5 30 NBK Cross Recessed Flat Head M5 length 30mm Screws SVSQS M5 30 NBK Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole. Pack of 20 NBK Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole. Part Number M L D1 D L1 B t T (Approx.) d (max.) SVSQS M3 5 M5 30MM 8. 5MM 10MM 5MM 4MM 1MM 1. 3 1. 5 The ventilation hole easily releases gas trapped in the screw holes of equipment and machines, and supports