Metal step drill bit set 5pcs 1/8″-3/4″ cobalt coated, 3/16″ 1/2″ 1/4″ 3/4″ 1-3

Metal step drill bits set 5 pcs.
Set include:
6 Steps: 3/16″ to 1/2″, (3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″)
9 Steps: 1/4″ to 3/4″, (1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8″, 11/16″, 3/4″)
10 Steps: 1/4″ to 1-3/8″, (1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1 -1/8″, 1-1/4″, 1-3/8″)
12 Steps: 3/16″ to 7/8″, (3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5 /8″, 11/16″, 3/4″, 13/16″, 7/8″)
13 Steps: 1/8″ to 1/2″, (1/8″, 15/32″, 7/16″, 15/32″, 1/4″, 9/32″, 5/16″, 11 / 32″, 3/8″, 13/32″, 7/16″, 15/32″, 1/2″)
Made of HSS high speed steel, coated with cobalt to increase the lifetime of the drills
The edges of the drilled hole remain clean and burr-free
Quick heat dissipation during drilling in hard materials
2 spiral chip grooves for efficient dust removal
Packed in practical aluminium case for storage and transportation