Question about hole callout on slot : rSolidWorks

Prusa holes & nut slot dimensions slot hole size Mild Steel Slotted Angles Size : 40x40 mm Available in different size 6ft , , 7ft, and 10ft 6ft , , slot area calculator Hole Pattern 18 x 1 Round-End Slot, Side Staggered, 18 x 1 Round-End Slot, Side Staggered ; Slot Width 18, 18 ; Slot Length 1, 1 ; Slot End Centers 1-1

slot canyon nm Cutting Depth · 1-78in ; Diameter · 1-18in ; Length · 1-58 ; Pilot Drill Size · 14 in Dia x 3-14 in L ; Model #: 3001818L