Panasonic's 14.4 V, EZ 7544, EZ 7546. It is used by Makita's 18 V, BTD 141, but there is no problem with the accuracy of the bit. As for the "ease of use" of the tool, it is often affected by "how to use" depending on the skill of the person using it, so I can not say anything in particular. Durability is also an ordinary bit. Due to mirror surface treatment of the surface and influence of oil of rust prevention treatment, screws are slippery when they are brand new, so they are first degreased and used.