No large ones, but (101) amazingly assorted small extension and compression  springs -- most, but not all, 1" to 2" long. You might even find a stray torsion spring! Assorted lengths, assorted widths, assorted finishes, a sorta handy bag of replacement parts to have around the house.

These Bulldog Hardware steel gate hinges are black and measure 4-1/2” tall. Outside plate is approx 3” square with a slight taper and (4) 1/4” bores. Inside plate is 4” long x 1-3/8” with (4) staggered 1/4” bores. Hinges swing 270 degrees for fully opened gates. You’re going to need at least two unless you're making a cat flap.

Your ordinary generic everyday plain old steel hinge measures 2" long x 1-1/2" wide when open with a 1/8" axle and mounting holes just a hair under 1/4". Comes with screws, as they will. Ordinary, yes, but necessary.

Big sack o' springs. You get (10) springs, mostly compression but probably with a few extension springs thrown in for dessert. Great for art projects, kinetic sculpture or creating tension in any number of scenarios. In sizes ranging from 3/4" long x 1/2" dia up to 2-5/8" long x 1-7/8" dia.

Is it spring? Well, it’s a spring. This steel extension spring is technically a “short throttle return spring” and measures 2-1/4" long x 7/16", but it will be just as happy returning anything else if your throttle is already back where it belongs.

This small compression spring measures 1" dia x 1-1/8" tall and is made from 1/16" dia 316-type stainless steel, designed for marine or other aquatic applications. Go mount a bouncing turtle.

You could fit all of these springs in the palm of your hand, but they're still mighty handy. Steel extension springs, 1/2" long x 3/8" dia with 5/16" ID loops at each end.

These steel compression springs are 3/4” long x 1/2” dia and made of 1/32” thick stock. Compressed right here in the US of A.

These plated steel extension springs measure 8-7/8" long (counting loops) x 7/8" dia x 1/8". Loops are approx 5/8" ID. Rated for just under a 20-lb working load. Good for screen doors and cabinets, and for hanging things that you like to see bounce in the wind.