The Full Strike Drive System makes this unit the lightest weight tool in its class- only 7 lbs. Packed with Fasten Edge Technology, an industry leading feature set, this nailer can take on any framing job. While the Ridgid R350HE nailer takes full advantage of modern tech to create a lighter-weight, more efficient tool, it doesn’t overdo anything. Porter-Cable FR350B; RIDGID R350RHF 21° 3-1/2 in. Framing Nailer. The dry fire lockout feature prevents empty drives and preserves the tool life. Weight 8.25 lbs. The RIDGID model R350RHF 21-degree 3 1/2 inch Round Head Framing Nailer is a perfect combination of power, weight and speed. Collation Type: Plastic; Depth Adjustment: Yes; Dry Fire Lockout: Yes; Fastener Length: 2″ to 3-1/2″ Fastener Type / Gauge: 20-22º The RIDGID 3-1/2 in. They call their feature set “Fasten Edge Technology.” RIDGID R350RHF 21 Degree Round Head Framing Nailer. Ridgid has done an excellent job of adding features that provide real benefits to the end-user without going overboard. Round Head Framing Nailer features magnesium housing for durability and lighter weight.