Creates the most popular masonry joint in the United States. Use this tool to make rounded sunken rodded masonry joints.

Additional products available.



Convex Jointer ½” x ⅝” (Pictured)

Creates a consistent concave joint every time for a watertight seal. Each end makes a different size joint for versatility. One end makes a 1/2″ joint, then flip it around for a 5/8″ joint. Made from formed high quality steel for durability. The jointer is then sent through a unique heat-tempering process for hardness and long wear. The steel is then polished for a smooth, perfect joint every time. The shape of the tool provides knuckle clearance as you move along the joints. The overall length of the tool is 10-1/2″ long. Proudly made in the USA.

  • Makes most popular joint in the USA
  • Strong carbon steel blade
  • Heat tempered for hardness
  • Hand polished for a perfect joint
  • Creates a concave joint
  • Forms ½” and ⅝”  joints with one tool
  • Creates a watertight seal in mortar
  • Designed for knuckle clearance
  • Overall length 10 ½”
  • Made in the USA
  • Part# KT-RO5121-1/2×5/8 

Product Specs:

  • Length: 10″
  • Width: 1/2″
  • Pattern: Convex
  • Material: Steel
  • Blade Material: Steel
  • Blade Type: Concave Joint


  • Grapevine Jointer (5/8″ x 3/4″) Part# BT11478
  • Grapevine Jointer (1/2″ x 5/8″) Part# BT11458
  • French Country V Jointer Part# BT11781
  • Concave Jointer (3/8″ x 1/2″) Part# BT11474
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