how do I open the case, grrr!?

Hello There is a black disposable component in the upper left corner that can be used after destructively removed We are sorry that our products have caused you an unpleasant experience We will document this issue and will improve it Have a great life

do drill bits have etched "HSS Co"? or else how do you know they are Cobalt drill bits?

3mm-13mm have HSS*Co logo and size marking 1mm-2.5mm is too small to be marked, but also contains cobalt

what tolerances can I expect?

From the product manufacturing technology: The diameters are all standard sizes Drill length and cutting edge length may have small measurement errors with the solid From the perspective of use: Borehole diameter, face tolerances range from 0.01mm to 0.5mm, and the tolerance slowly decreases as the depth increases Cordless drill with maximum tolerance for handheld operation Table drill tolerances will remain below 0.1mm Hope this helps with your question

what is the cutting tip angle?

Tip angle 118 ° This is the best angle for the cobalt twist drill. The tip angle of all sizes of the set is 118 °. The new product can be used out of the box without trimming and grinding.

Manufacturer	COPOUIXR
Part number	100002131
Item Weight	100 g
Product Dimensions	13.8 x 7.8 x 1.5 cm; 100 g
Item model number	Cobalt twist drill bits 13
Color	13pcs
Style	metal
Finish	Titanium or Titanium Carbon with glossy or semi-gloss finish
Material	Cobalt
Pattern	13pcs
Shape	Round
Item Package Quantity	1
Number Of Pieces	13
Measurement System	Metric
Included components	1.5mm-6.5mm Cobalt drill bit set
Batteries Included?	No
Batteries Required?	No

Cobalt Drill bit Set 1.5mm-13mm M35 Carbide Drill bits 5% Cobalt Twist Drill HSS 13-Piece Set Metric Drill bits Set for Metal (13pcs)

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