LKM5/16X6C
The MP3 Carbide tipped drill bit is designedto work on very hard material. The tip has a negative rack unlike other carbide bits. A great drill bit for use on GSA red label containers because of the hardness of the hardplate material.
LKM516X6C
The CHA5/16X6C drill bit has been discontinued. Lockmasters recommends replacing yours with this stronger, more durable, longer lasting drill bit.