there are a few of these around made in australia,germany and here. they include a bolt handle with various shapes of oversize knobs as 1 piece. look good-very expensive > $120. beretta usa has a plastic round knob that screws into the standard bolt handle,about $40. got one and it seems to work just fine. screws in with an expanding tab that holds it in place. to me,just fine but overpriced for what it is. does the job of making bolt manipulation easier for a bunch less $. just a heads up for tikka guys.