Strap Onto A Drain Pipe, A Post Or A Tree With A Thickness Up To Around 15cm (6in) Diameter. Lid Comes Off Simply To Fill The Feeder Or To Clean It, & Then To Put It On Again. With An Easy-twist Mechanism There’s An Audible Click When The Lid Is Once Again In Place. modern Design Fatball Feeder For Garden Birds. With Two Holders – One To House Fatballs, The Other To House Smaller Suet Bites. No Screws Needed. With Touch-fastening Strap Easy To Tie-around. Just Adjust The Strap To Fit Around Tree Trunks Of Different Thickness. waterproof Opening Keeps Contents Fresh & Healthy, Important For Birds’ Health & Hygiene. with Integrated Perch Nuthatches, Great Tits & Finches Can Land & Take The Contents Freely. They Will Arrive At Your Feeder Which You Can Fill With Fat Balls Up To Around 5cm In Diameter Or Smaller Suet Bites. dimensions: H20cm, Diameter 18cm