Are these good for make holes in steel material?

Yes，good for drilling steel.Generally, sellers purchase products from the market and sell them on e-commerce platforms. The STROTON drill bits we sell are designed and produced by our factory, including the case, which is unique on the market. This drill bit contains 6% cobalt, which is higher than general products. In addition, STROTON hss drill bits have a secret heat treatment recipe.So They’re good at drilling steel.

Where are these made?

They are made in China. They are very good cobalt drill bits set.It is designed and manufactured by STROTON, different from the similar products in the market.

Manufacturer	STROTON Ltd
Part number	Cobalt 6 series bits inch 1/16-1/2
Item Weight	516 g
Product Dimensions	18 x 13 x 4 cm; 516 g
Size	1/16-1/2 in (17PCS)
Finish	スチール
Material	コバルト
Number Of Pieces	17
Measurement System	SAE
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	18 x 13 x 4 cm

6%コバルトドリルビットセット (1/16インチ-1/2インチ 17個) ステンレススチールと硬質金属用 ダブル1/4ドリルビット付き

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6%コバルトドリルビットセット (1/16インチ-1/2インチ 17個) ステンレススチールと硬質金属用ダブル1/4ドリルビット付き