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Product name: 1/2 shank drill bit (commonly known as: small shank drill bit, equal shank drill bit, shrink shank drill bit)
Material: HSS high speed steel hardened
Surface treatment: use anti-rust oil for blackening
Unit: Branch
13-40mm size handle 1/2=12.7mm, 41-50mm size handle 3/4=19mm.
13 
13.5 
14 
14.5 
15 
15.5 
16.5 
17 
17.5 
18 
18.5 
19 
20 
20.5 
21 
22.5 
23 
24 
24.5 
25.5 
26 
26.5 
27 
27.5 
28 
29 
29.5 
30 
30.5 
32 
33 
34 
35 
37 
39 
40 
42 (handle 19mm) 
45 (handle 19mm) 
48 (handle 19mm)