These fit 10 Frame boxes only.
Moulded to Langstroth standard dimensions, has migratory vents, allocation for spring clips. (a longer screw will be required if applying clips)
The reinforced ribbing on the side of the lid gives added strength for strapping hives down tight.
The rebated lid sits proud of the top box, comes down the outer side wall locating over the top, eliminating any chance of rain entering the top box.
The ribbed design gives the lid added strength, durability and is UV stable for 30+ years.
Nuplas plastic lids are also interchangeable with wooden hives.