Anchors pre-drills precise hole in types of drywall ,no hole preparation required, made of durable zinc , easily removed. Deep thread design provides strong engagement, locks into many sizes of drywall for maximum holding power. Starts easier than other self-drilling drywall anchors hanging accessories, artwork, shelving, mirrors, picture frames, shelf straps, decoration fixing, calligraphy, curtain rods and small decorative shelves, and more. Hangs up to 50 lbs for Hanging and Mounting. Colour:silver Material:Metal Size:28mm Package Contents: 30 x anchor 30 x screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.