Machrus Ogrow Polycarbonate Replacement Panel K-A21 fits item # OGAL-46A. This is part number K-A21/SKU #OGRPT-K-A21 on Ogrow Greenhouse Manual. The size of this panel is 23.03 x 23.03 x 0.5" (L x W x H). The polycarbonate panels are safe and easy to handle and make your greenhouse shockproof and UV resistant. Get this Machrus Ogrow replacement panel to fix any missing/damaged panels on your Aluminum Greenhouse!