Ns20xp, 16 gauge, 7/16", crown stapler, uses 16 & 17 gauge 7/16 in. Crown heavy wire staples, 1" to 2" fastener range, 15 percent more powerful than all other construction staplers in its class, enhanced ez-clear latch allows for quick access to clear fasteners & a new aggressive locking feature provides superior holding power for complete control of the fastener, offering pinpoint accuracy & unrivaled drivability, new drive track design eliminates movement of the staple, enhancing overall drive performance & virtually eliminating fastener jams, skipping & misfires, rotatable belt hook, can be converted for use as vinyl siding stapler (vinyl siding attachment required - sold separately), includes: tool oil.