STAPLER Tool application letter Maximum fastener length, in inches that can be used with the tool 00 -S 00 P Type of tool ( P= powerpack) ( DL= double length) Gauge of fastener Indicates crown size ( W = wide) ( S = standard) ( I = intermediate) ( N = narrow) Maximum fastener length in millimeters O 000 / NAILER Tool application letter Maximum fastener length, in inches that can be used with the tool /O 000 Type of tool ( C = coil nailer) ( S = strip nailer) ( F = finish nailer) ( R = Roof naile