stainless steel angle code 90 degrees right-angle support furniture connecting piece one-shaped fixed piece shelf support multifunctional angle code

1.0 foot thick multifunctional angle code 1.2 foot thick multifunctional angle code 16*20 right angle (4000 pcs/piece) 16*25 right angle (3200 pcs/piece) 16*30 right angle (2400 pcs/piece) 16*40 right angle (1600 pcs/piece) 16*50 right angle (1200 pcs/piece) 16*60 right angle (1000 pcs/piece) 16*36 tablet (4000 pcs/piece) 16*46 tablet (3200 pcs/piece) 16*56 tablet (2400 pcs/piece) 16*77 tablet (1600 pcs/piece) 16*96 tablet (1200 pcs/piece) 20*45 right angle (1200 pcs/piece) 20*65 right angle (800 pcs/piece) 20*85 right angle (600 pcs/piece) 20*100 right angle (400 pcs/piece) 20*125 right angle (300 pcs/piece) 20*150 right angle (300 pcs/piece) 20*85 tablet (1200 pcs/piece) 20*125 tablet (800 pcs/piece) 20*165 tablet (600 pcs/piece) 20*195 tablet (400 pcs/piece) 38*45 right angle (600 pcs/piece) 38*65 right angle (400 pcs/piece) 38*85 right angle (300 pcs/piece) 38*85 tablet (600 pcs/piece) 38*125 tablet (400 pcs/piece) 38*165 tablet (300 pcs/piece)

no screws how many holes and how many screws