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.

What good is a drawer slide if it glides smoothly and then ends with a violent slam? A good set of slides is smooth and quiet, like these, from start to finish. Our pair is 22" long closed, 45" fully extended, and 1-3/4" wide, with precision ball bearings and tracks. They’re also lubricated, with rubber endpieces, for smooth quiet operation at any point in your drawer’s journey.

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.

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.