This alloy gold dredge is 123mm. (just under 5 inch). I got this little shorty made up to get into the hard access places. Only used once and caught fine gold. Slight angle on sluice box. Reason for selling - got a 4inch ultra mini. I noticed that it wouldn't release the stones from under the bars so was intending to grind some of the bars off the ripple tray. (photo shows finger pointing to this). This dredge is not perfect - it needs some small adjustments. Motor not included. Measures Floating sluicebox - 1000 mm x 700mm Pontoons for motor - 950mm x 750mm