30 Pack 1/4"-20 x 2-1/4" Hurricane Anchor Kit, Hardware Installation Guide Anchoring Set for Window Board Panel Shutter Mounting and Fastening

Suitable for the replacement, mounting, stabilizing and fastening of hurricane boards, window shutters, fabric panels before hurricanes arriving | This storm anchoring product includes washered wing nuts, anchor bolts, thread protectors and a driving tool | Anchor bolt is made of steel while protective cap is rubber, having the characteristics of weather resistant | Just using a 3/16" carbide bit or drill bit to drive the anchor bolt into the block or concrete wall | Standard/Coarse thread 1/4"-20; Embedded length 2-1/4"