fastener

I need to hang a new Vevor air hose reel on the wall in my shop, not sure which type of fastener to use. I have 3/8" x 3-1/2" lag screws with washers, or these new Simpson WS22 x 4” Timber Screws. I have plenty of both. Reel weights 23 lbs but is also subject to being tugged on to deploy the...

Anyone know what 3 dots on a fastener mean? Is it a strength rating?