58 Pc Pro-Series 5/8" T-Slot Clamping Kit Bridgeport Mill Set Up Set 1/2-13 Our Part # ALL-48010 Made of high quality casting steel for long life and increased durability. All parts heat treated. 5/8" T-Slot, 1/2-13 stud size, & 1" step block width (all standard) Includes (24) Studs- (4) each of 3", 4", 5", 6", 7", & 8" long &lt;/li&gt; &lt;li&gt;Also contains (4) coupling nuts, (6) forged steel step clamps (2 each based on stud sets), (12) steel step blocks, (6) flange nuts, (6) T-nuts, & wall holder