Hillman Fastener Corp 370827 Sleeve Anchor Concrete Sleeve Anchors design allows them to anchor into concrete, brick and block. Turning the nut pulls the working end of the sleeve anchor up through the sleeve, expanding and anchoring itself securely in the base material. Sleeve anchors have many uses including, but not limited to frame installations, electrical and mechanical attachments, and masonry applications. Size: 3/8 In. Length: 1-7/8 In. Material: Steel Finish: Zinc Minimum Embedment: Color: Head Type: Screws Included: Drive Type: Maximum Weight (Drywall): Maximum Weight (Concrete): Features Made in China USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.