Standard Pack = 1 piece(s). 305 Piece Socket Set Screw Assortment Contains:; (20) #8-32 x 1/4 IN; (20) #8-32 x 3/8 IN; (20) #10-24 x 1/2 IN; (20) #10-32 x 3/16 IN; (20) #10-32 x 1/2 IN; (20) 1/4-20 x 1/4 IN; (20) 1/4-20 x 3/8 IN; (20) 1/4-20 x 5/8 IN; (20) 1/4-20 x 3/4 IN;