Well It depends on what Tractor But Here are several Photos Of Sleeve Hitches
Gilson Late Model sleeve Hitch
Brinly adapter sleeve Hitch
Scotts By JD sleeve Hitch
John Deere X500 series sleeve Hitch also Called Integral Hitch
MTD manual Lift sleeve Hitch
Brinly adapter On Cub Cadet Narrow Frame
John Deere X500 series Sleeve Hitch (Integral Hitch Mounted On Tractor) will also Fit GT242 thru GT275, GT225 thru GT245, GX255 and 240,thur 285 and 320 Plus 325 Thru GX355
John Deere Older style Sleeve Hitch(Integral Hitch) for 110 & 112 Plus Model 200 thru 216
Simplicity Older Style 1 Point Hitch(sleeve Hitch)
John Deere240 thru 320 Sleeve Hitch (Integral Hitch)
Wheel Horse Clevis Hitch (Sleeve Hitch)
MTD Older style sleeve Hitch Late 1970 to Mid 1990's
There are So Many different Sleeve Hitches On the Market that were Made depending on the Brand Of Tractor But Basically They allow you to use Implements such as a Plow
with one Pin Connecting the attachment to the Tractor and it allows you to raise and Lower the attachment Hope this Helps :thThumbsU