We have two hammers both a combination of wide and cross peen faces and each weighing 500 grams (approx.16 oz). The use of either hammer should be restricted to anvil peening and the faces kept clean and smooth to insure a good finish on the blade. For the peening jig any 16 ounce, flat faced hammer will do. If you don't have one try your local hardware store, or just set your phasers to "peen".
Picard Scythe Hammer
Recently added to our inventory is a scythe hammer forged by the German company Picard. This is the top of the line hammer for freehand peening. It is a very well made and finely balanced peening hammer. The hardened faces give excellent rebound and feedback. You can feel as well as see the changes as the blade's edge responds. Both the face and cross-peen have slight convexity to improve performance, accuracy and limit marring of the scythe's cutting edge. This is an expensive hammer and is meant to be used for freehand peening. The Picard is similar in shape and weight to our Scythe Hammer # 9018 but of higher quality. We recommend restricting the use of either of these fine hammers to freehand peening to keep the faces in good condition. Not recommended for use with a peening jig. Weight 500 grams/16 oz.