This steel Double Size Slicker 3/8″x 1/2″ is the general size slicker you need for most brick joint re-pointing. Each end makes a different size joint, which is very helpful when re-pointing uneven joints. You must compress lime mortar joints for strength and to avoid cracking. The rounded arm of this slicker gives the installer the ability to compress the joint during the finishing process. This Double Size Slicker 3/8″ x 1/2″ is strong enough to withstand the compression needed for lime mortar. Made in Slovenia of hardened high carbon steel. Wash and dry immediately after use because hardened mortar on your tools will create a frustrating work environment.