Bosch HS1400 1/4 In. SDS-plus Bulldog Xtreme Mortar Knife is $14.38 at Amazon, down from the store's own list price of $21.09. That's 32% off ($6.71 less). We last checked this price on Nov 7, 11:52 AM ET. Prices at the store can change at any time, so check before you buy. Brand: Bosch. Type: Power tools. Picked for all trades and Carpentry & Framing.