KVP Mach Linear Comp Spacers are used to add length to a Mach Modular Linear Comp! OR you can spec your own comp a la carte for the perfect length linear comp! Each spacer is machined from 6061-T651 Aluminum and hard coat anodized for wear protection. The spacers incorporate an OD 1-1/4″ hexagonal wrench flat configuration for easy installation with a standard open end or adjustable wrench.