You can drag alpha textures using the Drag dot stroke method one by one, but you can also take advantage of the radial array that is available in Sculpt mode. This is convenient if you need to create a perfect circular array of bolts, for example.

Free alphas from Bergman3D.
https://bergman3d.gumroad.com/l/YBBwJ

Follow Blender Secrets on Youtube
https://www.youtube.com/c/BlenderSecrets

Free Sample PDF
https://mailchimp.blendersecrets.org/freesample

Full Blender e-book with free updates
https://blendersecrets.gumroad.com/l/IxofeY
https://blendermarket.com/products/blender-secrets