The points must be consistently sharp. JIS 1125 specifies the point angleto be 25 to 45 degrees. This range is actually too wide to provide fast,consistent metal piercing. Those points closer to 25 degrees tend to drivefaster than those closer to 45 degrees. Experience has indicated thatpoint angles on “cone point” drywall and metal piecing screws heldbetween 25 and 32 degrees provide the best piercing performance