The Harrod Slot And Lock Aluminium Raised Pond Covers Are A Great Way To Protect Your Pond - And Fish- From Herons, Falling Larger Leaves And Other Pond Undesirables And You Can Be Sure These High Quality Covers Will Last For Years.the Raised Pond Covers Utilise The Rhs Chelsea Flower Show Garden Product Of The Year 2012 Award Winning Slot And Lock Technology To Hold The 16mm Diameter, Corrosion Resistant (always Handy Near Water) Black Powder Coated Aluminium Framework Securely Together, Allowing The 16mm Extruded Polyethylene Mesh Netting - As Used As Standard On The Side Of Our Fruit Cages - To Get On With The Job Of Pond Security.available In Size Options From 1m Up To 3m, The Raised Pond Cover Sits On The Surface Around The Pond And The 40cm High Cover Is Braced At The Corners For Extra Rigidity.both Lightweight For Easy Access And Durable, The Slot And Lock Pond Covers Will Keep Fish Happy And Herons Glum For Years To Come. please Note That The Harrod Slot And Lock Aluminium Pond Covers Are Not Designed Or Guaranteed To Prevent Children And Pets From Falling Into Ponds.raised Pond Cover Is 40cm High And Stands Clear Of Marginal And Aquatic Plantsavailable In A Range Of Size Options From 1m Up To 3mframework Made From 16mm Diameter, Anti Corrosion Black Powder Coated Aluminum Tubingpond Covers Use Award Winning Slot And Lock Connectorsraised Cover Has Braces For Extra Rigiditylightweight For Easy Accesskeeps Out Herons And Falling Leavesnot Designed Or Guaranteed To Prevent Children And Pets Falling Into Waterflat Aluminium Pond Cover Is Also Available.