The Low Profile Cabinet screws' washer style head seats flush and increases holding power for a secure installation. The star drive eliminates stripping for improved productivity while the W-Cut reduces installation torque allowing for fast driving and ease of install. Climatek corrosion resistant coating is ground contact lumber approved. Washer Style Head - Seats flush and increases holding power for a secure installationStar Drive-Eliminates stripping for improved productivityW-Cut - Low installation torque allows for fast driving and ease of installZip-Tip -Allows for no-predrilling and one step applicationGround Contact Lumber Approved-Worry free use in pressure treated lumber