Bikemonger says...... For the speedy attachment of Salsa direct mount bags. Also works well for other brands.

Salsa says..... Salsa EXP Series Direct Mount Thumb Screws allow for quick and easy attachment of Salsa EXP Series Direct Mount Packs to bicycle frames equipped with direct-mount locations.

Can be installed and removed by hand or with allen key
Includes necessary 0.5 mm washers and 4 mm spacers
Sold in pack of two