[perpendicularity] The brackets are 100% perfect 90-degree vertical angle. [LOAD ]The Specially made alloy metal material is lighter but stronger than the others on the market. It has greater load- bearing capacity, It can hold up to 320 pounds each pair , 280 pounds is the best weight bearing effect [powder coating finished] Matte black coated finish , and sturdiness. L bracket comes with traditional matte black,It fits in perfectly in your farmhouse kitchen, garage, basement storage room, and backyard. [Complimentary PACK]high strength screws ,screws and anchors are for hard walls. Following the steps properly, put your Pre-prepared lumber board on, you get your perfect and stable floating shelves. Color: As shown Material: Stainless Steel Package Contents: 4*L Shelf Brackets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.