How low can the spotter arm go?

I purchased this adjustable rack about 6months ago, and it gets the job done. The spotter arm can be adjusted as low as 2'06" off the floor, possible floor but that's what I have it set at right now.

This works for rack pulls and bench work or no?

I bought them to use for benching and incline benching and squaring not sure if that answers your question but the higher you raise them you need a plate weight on the legs of them little wobbly but mainly use it for bench work outs

What is the correct tool/size to make sure the bottom nuts are fully tightened as doing it by hand leaves a lot of space in between nut and bar ?

I used two wrenches. One to hold and the other to tighten. They're called lock nuts, they have that blue rubber piece in them. You can tighten through them and will stay in place thereafter.

Color	Metal Black Finish
Size	17.7"(L) x 20.1"(W) x 40"-66" (H)
Style	Squat Racks
Material type	Alloy Steel
Batteries included?	No
Brand	F2C
Maximum weight capacity	550 Pounds
Department	Mens
Manufacturer	F2C
Manufacturer reference	F2CW09S010701
Product Dimensions	51.05 x 44.96 x 168.91 cm; 8.39 kg
ASIN	B018XDH17K

F2C Max Load 550Lbs Pair of Adjustable Squat Rack 41"-66" Sturdy Steel Barbell Rack Free Bench Press Stands GYM/Home Gym Portable Dumbbell Racks Stands

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