Duravent 4PVL-FSR Pellet Vent Ceiling Support Firestop Spacer, 4" Hose Couplings The flutes are ground behind

The flutes are ground behind the lands to funnel chips to the inside of the bit and away from the outside diameter

Dichromate finish

Extra heavy duty rubber-coated 7” wheels – for maximum stability

Work Load Limit: 3500 lb

Boring spade bit

Duravent 4PVL-FSR Pellet Vent Ceiling Support Firestop Spacer, 4" Hose Couplings The flutes are ground behindHighlights: Inside Diameter: 4" Required where vent passes through ceiling Centers pipe to provide proper 1" clearance Spacer (for 3" clearance) Cannot be used with other manufacturer systems Double wall pipe air insulated design 0. 012" 430 stainless steel inner wall 0. 018" galvanized steel outer wall For use at elevation 4000' above sea level Warning: This product can expose you to chemicals including Chromium (hexavalent compounds) which are known