Modern Design Seed Feeder For Wild Birds With Touch-fastening Tie-around. No Nails Needed. Just Adjust The Strap To Fit Around Trees Of All Different Girths. Fill With Seed Mixes Or Suet Pellets. waterproof Opening Keeps Contents Dry & Fully Fresh. Easy-twist & Click Mechanism To Take Off & Put On Lid. fit Onto A Post, A Drain Pipe Or A Garden Tree Off All Girths Up To Around 15cm (6in) Diameter. The Lid Is Easy To Take Off To Fill The Feeder Or To Clean It & Put Back On Again. With An Easy-twist Mechanism You Hear With A Click When The Lid Is Firmly In Place Again. with Integrated Perch Pretty Blue Tits, Great Tits & Finches Have Somewhere To Land & Feed Comfortably. They Will Come To Your Feeder Which You Can Fill With Seed Mixes, Mealworms, Suet Pellets Or Sunflower Hearts. dimensions: H20cm, Diameter 18cm