No pre-drilling necessary Drills directly into drywall Deep threads and toggle-clamp for superior hold up to 90 lbs. in 1/2 in. drywall Max. fixture thickness: 5/8 in. ; no.8 x 2-1/8 in. sheet metal screw Installs quickly and easily with a no.2 Phillips or cordless screwdriver Applications: heavier shelving and supports, mirrors, brackets and bulletin 9/16 in. x 2-1/2 in.