A Hillman assortment of class 8.8 metric hex cap screws with thread sizes M4-0.70 and M5-0.80. Hex cap screws, or hex bolts, are perfect for most applications in which a stronger, sturdier bolt is desired. A common feature on hex cap screws is a washer surface directly under the head which creates a better seal. The assortment features hex cap screws in variants featuring M4-0.70 and M5-0.80 coarse screw thread in lengths ranging 10mm thru 50mm. Full assortments of #1438 contain twelve (12) refills comprising Hillman item numbers #1439 - #1450.