An ordinary SD drill that is not a pack item is a conical tip, it was very troublesome to use it without first thinning grinding if I bought it. This SDXJP pack product is easy to use because it has X type thinning, it became very convenient. Durability seems to be the same as ordinary high-speed drills such as SKH 9 and SKH 2 in the past, and it is being used while re-grinding relatively frequently.
In order to make a screw hole, it is necessary to puncture the hole precisely, but since the drill advances straight without using a punch, we drilled a hole aiming for a thin line of scribe. The moment of moment of hitting the material is very good, so it was easy to drill in the place I was aiming for.