Empty Pallets, Full Stack
Frames are the gateway block to building. They can be used to rough out base ideas or as temporary scaffolding.
Pick them up at any time. Upgrade them with wood & a construction tool to make them permanent and much stronger.
Repair with wood & a construction tool.
Crafting
Craft at Backpack · makes 1
Crafted as 
Wood Furniture: pick this one of its variants when you place it.
Harvest drops
Wood× 2
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Wood Debris (Terrain) (75% of the time) where it lands.
Where to find (371 POIs)
7 Days Suites (tier 5), Area 7 (tier 5), Champions Coliseum (tier 5), Correa Rockworx (tier 5), Crack-a-Book HQ (tier 5), Dishong Tower (tier 5), Haven Hotel (tier 5), Hybrid Mining (tier 5), Navezgane Athletics Complex (tier 5), Navezgane Corrections (tier 5), Navezgane County Jail (tier 5), Navezgane General Hospital (tier 5), Ostrich Hotel (tier 5), Pop-N-Pills Factory (tier 5), Red Mesa Compound (tier 5), Shamway Factory (tier 5), Shotgun Messiah Factory (tier 5), The Last Sunset Nursing Home (tier 5), Two Bit Tower (tier 5), U.S. Army Post #7 (tier 5), Vanity Tower (tier 5), Aranea Caverns (tier 4), Beanthere Coffee Company (tier 4), Camp Hollow Point (tier 4), ChemTech Distribution Center (tier 4), Close Encounters Gun Range (tier 4), Coleman's Drive-In (tier 4), Diamond's Mens Club (tier 4), Don Vittorio Spagetto Residence (tier 4), Doominium Tower (tier 4), Downtown Marketplace (tier 4), Ecotrash Recycling Center (tier 4), Fort Choppa (tier 4), Fort Quonset (tier 4), Goldrush Station (tier 4), Good Life Apartments (tier 4), Granddaddy's Cable Regional Service Center (tier 4), Green Hill (tier 4), Hotel Zombona (tier 4), Housing Development (tier 4) and 331 more.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.